Bird cage



FIG. 1 is a front view of the bird cage of the present invention, the rear view being a mirror image thereof;

FIG. 2 is a top view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front, left perspective view thereof; and,

FIG. 5 is another perspective view thereof showing the top in opened position. 

The ornamental design for a bird cage, as shown. 